Oscillating shoe abrading apparatus



May 3, 1955 R. T. osMAN OSCILLATING SHOE ABRADING APPARATUS 3Sheets-Sheet 1 Filed Maron 6, 1950 I INVENTOR. (N g/f um filo/"neg smwMay 3, 1955 R. T. osMAN 2,707,357

OSCILLATING SHOE ABRADING APPARATUS Filed Maron 6, 1950 5 Sheets-Sheet 2mi, i

IN VEN TOR.

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OSCILLATING SHOE ABRADING APPARATUS Filed March 6, 1950 s sheets-sheet s73 72 2X/4 TM 4"/ l/ll/l//ffli//fflik :ffm/wey Unted States Patent OOSCILLATING SHE ABRADING APPARATUS Ralph T. Osman, Whitefish Bay, Wis.,assigner to L. E. Jones, Menominee, Mich.

Application Marcil 6, 1950, Serial No. 147,905

This invention relates to abrading apparatus of the oscillating shoetype wherein a ilat abrasive sheet is caused to execute a recurrentmotion and the invention resides more particularly in an improved formot` said apparatus in which the abrading shoe is mounted for limitedfreedom or". longitudinal and horizontal movement with respect to aframe carrying an eccentric member which is rapidly driven and in whicha resilient or lexible non-positive connection is provided between theeccentric member and the shoe for the purpose of imparting to the shoeoscillatory or gyratory movement which may vary from the strictoscillatory gyration dictated by an eccentric member, the inventionincluding at times means adapted to cause modification of theoscillatory motion executed by the shoe.

This invention is related to and in certain aspects constitutes animprovement over the recurrent motion abrader set forth in my Patent2,441,506 issued May l1, 1%8.

Heretofore various forms of apparatus have been proposed in which anoscillating or gyrating abrading shoe has been mounted on a frame anddriven by a rapidly rotating eccentric member carried by the frame uponwhich the shoe is mounted. In these apparatuses the connection betweenthe eccentric and the shoe has included non-yieltlable meansconstituting a positive connection thus compelling the shoe to oscillatewith an amplitude in at least one direction which corresponds exactlywith the throw of the eccentric. Because of the high inertia forcesinvolved in rapidly oscillating the shoe the loading imposed upon thebearings carrying the eccentric member has been severe. As a result thebearings required to meet the peak stresses have been expensive.

lt is one object of this invention to provide apparatus of the characterdescribed wherein the peak stresses imposed by inertia eiects aresubstantially reduced thus relieving the bearings of excessive loading.

Also in apparatuses as heretofore constructed, in which a positiveconnection is provided between the eccentric member and the shoe, nomeans for altering or modifying the character cr amplitude of theoscillation of the shoe has been made available to the operator of theapparatus. it is an object of this invention to provide an abradingapparatus of the character described in which the operator may, if hedesires, cause the machine to eXecute a fast cutting elliptical gyrationover a substantial portion of the shoe or, alternatively, he may causethe shoe to execute a more nearly lineal or longitudinally extendingoscillation for the purpose of avoiding introduction of circular marksin the work or for the purpose of removing previously cut circular marksin the work.

The apparatus of this invention is also well adapted to be embodied in aform in which a combined elliptical gyration at one end of the shoe andnearly longitudinal oscillation at the other end of the shoe is causedto take place as set forth in my Patent 2,441,506 aforesaid wherein theoperator may avail himself of a rapid cutting motion or a ne finishingmotion by altering the pressure applied to the ends of the shoe.

2,707,357 Patented May 3, 1955 This invention is herein set forth anddescribed by reference to the accompanying drawings forming a parthereof and in which there is set forth by way of illustration and not oflimitation certain forms in which the apparatus of this invention may beembodied.

Fig. l is a side View in elevation and partly in section of one form ofthe apparatus of this invention;

Fig. 2 is a top plan view on a reduced scale of the appa ratus shown inFig. 1;

Fig. 3 is a detail side View in elevation and partly in section of therubbing shoe, members attached thereto and the actuating eccentricmember of the apparatus shown in Fig. 1;

Fig. 4 is a plan view of the apparatus shown in Fig. 3;

Fig. 5 is a rear end view in elevation of the apparatus shown in Figs. 3and 4.

Fig. 6 is a view in side elevation of the rear portion ot' the apparatusshown in Figs. 3, 4 and 5.

Fig. 7 is a side View in elevation and partly in section of another formof apparatus of this invention;

Fig. 8 is a plan view of the rubbing shoe shown in Fig. 7;

Fig. 9 is a side View in elevation and partly in section of theapparatus shown in Fig. 8, viewed through the plane 9-9 there indicated;

Fig. 10 is an end view in section and partiy in elevation ot theapparatus shown in Fig. 8, viewed through the plane 10--10 thereindicated;

Fig. 1l is a bottom plan view of the shoe plate of the apparatus shownin Fig. i, illustrating diagrammatically one form of the movementthereof, and

Fig. 12 is a bottom plan view of the shoe plate of the apparatus shownin Fig. 1 illustrating diagrammatically another form of the movementthereof.

rhe form of the apparatus of this invention shown in Fig. 1 is providedwith a frame generally designated 1 on the top of which a motor 2 havinga. downwardly extending vertical shaft 3 is mounted. Secured to shaft 3is a sheave 4 disposed in alignment with and drivingly connected to asheave 5 by belt 7. Sheave 5 is rotatably mounted beneath frame 1 bymeans of a bearing 11 carried on stub shaft l2 which is held in place byscrew 6.

As will be noted in Figs. l and 4, sheave 5 is divided into upper andlower halves held together by screws 10.

Disposed within the lower half of sheave 5 is a bearing 13 which ismounted for rotation on a post 14 which post 14 is secured in turn to ayieldably mounted shoe driving member 9 by a screw 8. The bearing 13 isdisposed eccentrically with respect to the center of bearing 11 andconnects the sheave 5 to the post 14 on member 9 so that post 14 iscaused to gyrate in a circular path upon rotation of sheave 5.

As shown in Figs. l and 4, shoe driving member 9 is yieldably attachedto a bottom or shoe plate 15 by means of a yieldable rubber mounting 18,held in place by a screw 16 and nut 17 passing through a pedestal 19secured to plate 15. The mounting 13 is preferably formed withconcentric, inner and outer bushings secured to the rubber by vulcanizedbonds as shown so as to completely isolate the member 9 from anymetallic connection with the shoe 15. In this Way the connection betweenthe eccentric bearing 13 and the shoe 15, at the left hand end of member9, is rendered yieldable or ilexible rather than positive.

At its right hand end member 9 is provided with a cup shaped receptacle2.1 adapted for the insertion of. a plug 22 formed of rubber or otherresilient material, said plug being attached to a longitudinallyadjustable rod 23. Rod 23 is positioned for slidable movement throughupright flanges 24, 25 and 26 of a bracket support member 27 which isattachedIto shoe 15 by rivets 28. A coil spring 29, in compression,surrounds rod 23 to bear against collars 30 and 31. Collar 30 is heldagainst motion to- Ward the left with respect to rod 23 by a key shown,while collar 31 admits rod 23 for free sliding movement therethrough.The plug 22 may be disengaged from contact with the cup shaped righthand end of member 9 and entirely withdrawn therefrom by movement of rod23 through manipulation of its handle 32 extending therefrom. When rod23 is pulled back far enough to cause a short transverse pin 33projecting Afrom rod 23 to be drawn backward through a key way 34, insupporting Piange 26, as shown in Fig. 5, the rod 23 may be turned byhandle 32 through an arc 0f 90 degrees to move me handle 32 into ahorizontal plane, whereupon pin 33 is held against the rear surface ofiiange 26 thus preventing plug 22 from engaging or interfering withmennber 9.

With plug 22 held in engagement with cup 21 tiexiblc or yieldablenon-positive connection is established between the right hand end ofmember 9 and the shoe 1S as well as the yieldable connection provided atthe left hand end of member 9 by the rubber mounting 18. When the plug22 is withdrawn from the cup 21 a single yieldable connection only isprovided between the member 9 and the shoe 15.

As shown in Figs. l, 3 and 4, there is secured to shoe plate 15,adjacent its forward corners, cylindrical, yieldable rubber mounts 35 ofcolumnar form, the upper ends of which are in turn fastened to frame 1by screws 33. Because of their composition and cylindrical shape themounts 35 may be deflected horizontally in any direction, symmetrically,with equal ease. the mounts 35 act to position the front end of the shoe1.5 vertically with respect to the frame 1 and to transmit workingthrust from the frame 1 to the shoe 15. Secured to shoe plate 1 5adjacent its rear end is an upright iiat transverse mounting member 36of yieldable rubber cornposition which acts as a vertical positioningand thrust transmitting mounting and which guides the rear end of theshoe for relatively free displacement in the longitudinal direction.However, because of the transverse stiffness of member 36 the rear endof the shoe 15 can be displaced but little in the transverse direction.Secured to the top of member 36 is a channel shaped metal member 37,which is secured in turn to the right hand end of trarne 1 by screws 39.

When motor 2 is supplied with electric current causing shaft 3 andsheave 4 to rotate, eccentrically disposed bearing 13, driven throughbelt 7, is caused to move in a circular path thus carrying member 14around with it and causing a gyrating movement of the member 9. Sincemember 9 is yieldably rather than positively connected to the shoe 15,the motion imparted to the shoe 1.5 is

not of the same coniguration and amplitude as that of the eccentric evenwhen plug 22 is in engagement with the cup 21. Under the lattercondition the movement imparted to the shoe 15 is such that the samefollows a generally elliptical configuration at the left end of the shoe15 adjacent to the symmetrically deiiectible mounts 35, which gyrationis of smaller average amplitude than the throw of the eccentric 13.

At the rear or right end of shoe 15 a different action takes place.Because of the specific location of eccentric bearing 13 with referenceto the forward and rear ends of shoe plate 15, and because of thegreater resistance to transverse deiiection offered by the transversemount 36, the motion progressively modifies from an elliptical gyrationat the front or" shoe 15 toward a nearly straight line oscillation asthe rear end of the shoe is approached. The general nature of the motionexecuted by various points in shoe plate 1.5 under such conditions maybe represented by the paths shown in somewhat exaggerated proportions inbroken lines in Fig. ll. With this motion, the operator may aspreviously pointed out, apply pressure to the left end of shoe 15 tocause a rapid cutting action or to the longitudinally moving right endof the shoe 15 to produce a iine finishing action. In either case theyieldable connection between the member 9 and the At the same time 9shoe 15 relieves the bearings of peak stresses and limits the loadingwhich the operator may apply by exerting working pressure, since suchyielding action between the member 9 and the shoe 15 will in substantialmeasure reduce the amplitude of motion of the shoe 15 when overloaded.

The clutch forming members 21 and 22 are within the immediate control ofthe operator, by manipulation of handle 32, and may be readily separatedto provide an even greater degree of transverse yielding in theconnection between the eccentric and the shoe 1.5. With the clutchmembers disengaged the movement of shoe plate 15 is immediatelytranslated into substantially longitudinal oscillation as illustratedgenerally in Fig. l2.

To obtain a uniformly fine non-eirclin y abrading action, particularlyfor a final finishing operation, the operator may thus disengage clutchmembers 21 and Z2 as shown in Fig. 3 and thereby obtain a slower cuttingbut finer finishing action without any tendency whatever to leavecircular marks in the work.

Another form of the present invention, not including a choice of shoemotion, is shown in Figs. 7, 8, 9 and l0 wherein a shoe plate 6i) isprovided with deiiectible rubber mountings 76, As shown in Fig. 7, theapparatus is provided with a trame 61 which carries the shoe 6) throughthe mounts '76 attached by screws 77. The frame 65 also supports a motor62 having a downwardly extending shaft 63. Secured to shaft 63 is asheave 64 disposed in alignment with a sheave with belt 66 forming adriving connection between sheaves 64 and 65, sheave 65 being rotatablysecured to frame 61 by screw 67. In a manner identical with theconstruction of sheave 5 shown in Fig. 1, sheave 65 is provided withupper and lower bearings, the center of the latter being disposedeccentrically relative to the center of said upper bearing which ismounted for rotation on a depending post secured to frame 61 by screw67. Said lower bearing is mounted for rotation on upstanding post 68secured to shoe driving member 69. As shown in Figs. 8 and 10, shoedriving member 69 is flexibly attached to shoe plate 60 at its forwardend, being secured to a yoke 71 which is slidably supported on the crossbar 7i) carried at its ends by flanges or brackets 72 and 73 which aresecured to shoe plate 60. Member 69 is mounted at its opposite end forpivotal action in a yieldable rubber mount secured to shoe plate 60 byscrew 78. Springs 74 and 75 surrounding bar which are held incompression on both sides of yoke 71, provide a yieldable connection ofpredetermined stiffness between the left end of member 69 and the shoe60. The circular gyratory motion of the eccentric within sheave 65rotating on post 68 is thus modified and the motion induced in the shoe60 is similar to that illustrated generally by Fig. ll since the actionof the shoe illustrated in Fig. 8 is substantially similar to that shownin Fig. 4. Translation of the circular gyration of the eccentric intomoditied elliptical motion in the shoe 60 is, however, somewhatdifferent because the resiliency of cylindrically shaped posts 76 ofmolded rubber composition carrying the shoe 65 is uniform in alldirections. In this modilication of the apparatus of this invention theadvantages of a yieldable connection between the eccentric and the shoeare exhibited although not to the full extent realized in the apparatusshown in Fig. ,1.

I claim:

l. In an oscillating shoe abrading machine the combination of anabrading shoe adapted to bear an abrading coating, a frame, flexiblemounting means secured between said shoe and said frame, said mountingmeans including means deiiectible with equal ease laterally andlongitudinally at one end of said shoe and a transverse mountingdeectible more easily longitudinally of said shoe at the opposite endthereoi, a motor driven rotatable member mounted on said frame, anintermediate driving member yieldably secured to said shoe at a point ofaroma? pivotal attachment therewith for swinging motion parallel theretoand having a free end movable freely transversely of said shoe, aneccentric driven by said rotatable member, means providing an eccentricdriving connection between said eccentric and said intermediate memberfor driving said shoe with a substantially longitudinal oscillatorymovement when the free end of said intermediate member is unrestrained,and an adjustable stop movable from open to closed position includingmeans for maintaining said stop in open and closed positions mounted onsaid shoe and positioned to engage and resiliently restrain the free endof said intermediate member when in closed position to cause movement ofsaid shoe to be modified from substantially longitudinal oscillation toan elliptical gyration at one end which progressively alters towardsubstantially straight line oscillation at the opposite end of saidshoe.

2. In a rubbing machine, a rubbing shoe, said shoe including a rigidreinforcing plate, a frame, a flexible mounting means securing said shoeto said frame, a power driven rotatable member mounted on said frame, aneccentric driven by said rotatable member, an intermediate drivingmember having a portion in driven engagement with said eccentric andhaving a point of swingable attachment to said reinforcing plate whichis spaced a substantial distance from said eccentric engaging portion,and resilient restraining means for said intermediate driving membersecured to said reinforcing plate and engaging said intermediate drivingmember at a point remote from the point of swingable attachment thereofto said plate, said resilient restraining means being movably mountedfor engagement with and disengagement from said intermediate drivingmember, and manually operable shifting and securing means cooperativelyconnected to said restraining means for moving the same into and out ofengagement with said intermediate driving member and for holding thesame in either of said positions.

3. In a rubbing machine, a rubbing shoe, said shoe including a rigidreinforcing plate, a frame, a flexible mounting means securing said shoeto said frame, a power driven rotatable member mounted on said frame, aneccentric driven by said rotatable member, an elongate intermediatedrving member having a portion intermediate its ends connected in drivenrelation with said eccentric and having a point of swingable attachmentto said reinforcing plate which is spaced a substantial distance fromsaid eccentric engaging portion and adjacent one end thereof, andresilient restraining means for said intermediate driving member, saidrestraining means being secured to said reinforcing plate and engagingsaid intermediate driving member at a point adjacent the opposite endthereof, said resilient restraining means having a portion thereofmovably mounted for separable connection with said intermediate drivingmember, and manually operable shifting means cooperating with themovable portion of said restraining means to connect or disconnect thesame with said intermediate driving member.

4. In a rubbing machine, a rubbing shoe, said shoe including a rigidreinforcing plate, a frame, a flexible mounting means securing said shoeto said frame, a power driven rotatable member mounted on said frame, aneccentric driven by said power driven member, an elongate intermediateshoe driving member having a portion intermediate its ends connected indriven relation with said eccentric and having a point of swingableattachment to said reinforcing plate which is spaced a substantialdistance from said eccentric connecting portion and adjacent one endthereof, and resilient restraining means for said intermediate drivingmember secured to said reinforcing plate and engaging said intermediatedriving member at a point remote from the point of swingable attachmentthereof to said plate, said resilient restraining means comprising a barmember movably mounted on said reinforcing plate and adapted to engageone end thereof with said driving member, a handle at the other end ofsaid bar member for manually withdrawing said bar member and disengagingthe same and resilient means for normally urging said bar member intoengagement with said driving member.

5. In a rubbing machine which is characterized by an oscillating shoeand a rigid frame for supporting said shoe, a eXible mounting meanssecured between the shoe and the frame at one end of the shoe, whichmounting means is deflectible equally in the transverse and longitudinaldirections relative to the shoe, and a transversely extending mountingmeans at the opposite end of the shoe which is deflectible to asubstantially greater degree in the longitudinal direction than in thetransverse direction of the shoe, a power driven rotatable membermounted on said frame, an intermediate shoe driving member, a yieldablepivot attaching one end of said driving member to said shoe for swingingmotion parallel thereto, said driving member having its other end freefor movement transversely of said shoe, an eccentric driven by saidrotatable member, a driving connection between said eccentric and saiddriving member for driving said shoe with a substantially longitudinaloscillatory movement while said end is free for transverse movement, andan adjustable stop member mounted on said shoe which is movable from anopen to a closed position, said stop member in the closed positionresiliently engaging the free end of said intermediate driving memberand causing the movement of said shoe to be modified whereby themovement of the shoe is elliptical at one end and substantially straightline oscillaton at the opposite end.

6. In a rubbing machine which is characterized by an oscillating shoeand a rigid frame for supporting said shoe, a exible mounting meanssecured between the shoe and the frame at one end of the shoe whichmounting means is deflectible equally in the transverse and longitudinaldirection relative to the shoe, a transversely extending mounting meansat the opposite end of the shoe which is deilectible more easily in thelongitudinal direction than in the transverse direction of the shoe, apower driven rotatable member mounted on said frame, an intermediateshoe driving member yieldably and pivotally attached to said shoe forswinging motion parallel thereto and having a free end which is movabletransversely of said shoe, an eccentric driven by said rotatable member,a driving connection between said eccentric and said intermediate memberfor driving said shoe with a substantially longitudinal oscillatorymovement when the free end of said intermediate driving member isunrestrained, and an adjustable stop mounted on said shoe which ismovable from an open to a closed position, said stop being positionedwhen closed to engage and resiliently restrain the free end of saidintermediate driving member thereby causing the movement of said shoe tobe modified from substantially longitudinal oscillation to an ellipticalgyration at one end which progressively alters toward substantiallystraight line oscillation at the opposite end of said shoe.

7. In a rubbing machine, the combination of a rigid frame, a power shaftextending downwardly of said frame, a driven member rotatably mounted onsaid frame in laterally spaced relation to said power shaft andconnected in driving relation therewith, said driven member having aportion eccentric to its axis of rotation, a rubbing shoe, flexiblemeans connecting said rubbing shoe to said frame, an elongateintermediate shoe driving member having end portions spaced above saidrubbing shoe, a bearing intermediate the ends of said shoe drivingmember and connecting said eccentric portion of said power driven memberin driving relation therewith, and independent flexible connecting meansbetween the opposite end portions of said shoe driving member and saidshoe, the exible connecting means at one end of said shoe driving membercomprising manually separable members whereby to permit one end of saidshoe driving member to be disconnected relative to said shoe.

aver/,357

8. In a rubbing machine, the combination of a rigid frame, a power shaftextending downwardly of said frame, a driven member rotatably mounted onsaid frame in spaced relation to said power shaft and connected indriving relation therewith said driven member having a portion eccentricto its axis of rotation, a rubbing pad, means flexibly connecting saidrubbing pad to said support and permitting limited relative movement inall directions between said pad and said frame, an elongate intermediatedriving member between said frame and said rubbing pad, a bearingintermediate the ends of said intermediate driving member and connectingsaid eccentric portion of said power driven member thereto, andindependent means for ilexibly connecting the opposite end portions ofsaid intermediate driving member to said rubbing pad, the flexibleconnecting means at one end of said intermediate driving membercomprising manually disconnectible members, and one of said membersbeing movably mounted relative to said rubbing pad,

whereby one end of said intermediate driving member f may bedisconnected relative to said rubbing pad.

9. In a rubbing machine, the combination of a rigid frame a power shaftextending downwardly in said frame, a driven member rotatably mounted onsaid frame and connected in driving relation with said power shaft, saiddriven member having a portion eccentric to its axis of rotation,arrubbing shoe, flexible means connecting said rubbing shoe to saidsupport, an elongate intermediate shoe driving member having endportions spaced above said rubbing shoe, a driving connection betweenintermediate portions of said shoe driving member and said eccentricportion of said power driven member and independent means for flexiblyconnecting the opposite end portions of said shoe driving member to saidshoe, the flexible connecting means at one end of said shoe drivingmember comprising separable members, and means for movably supportingone of said separable members comprising an elongate bar on which saidmember is mounted, bracket means on said shoe for supporting said barfor movement relative to said shoe and to said shoe driving member, andshifting and securing means associated with said bar whereby to permitone end of said intermediate shoe driving member to be connected ordisconnected relative to said shoe.

Cited in the tile of this patent UNLTED STATES PATENTS 1,741,145 DrennonDec. 31, 1929 2,284,671 Meinzer June 2, 1942 2,334,172 Champayne Nov.16, 1943 2,367,668 Champayne Jan. 23, 1945 2,441,506 Osman May 11, 19482,517,548 Dobson Aug. 8, 1950

